Part A
ADM4852ARZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4726 個数
- Package
- SOIC-8
- Series
- インターフェース - ドライバ、レシーバ、トランシーバ
Replacement verdict
Compatible functional replacement candidate
The ADM4852ARZ and ADM4851AR are both half-duplex RS-485/RS-422 transceivers in an 8-lead SOIC package with identical pinout and supply voltage requirements, making them strong functional replacement candidates. The primary distinction is the receiver input impedance: the ADM4852ARZ provides a full 1/8 unit load (allowing up to 256 nodes on the bus), while the ADM4851AR is a standard 1/4 unit load device (up to 32 nodes). Designers must confirm that the target network's node count and bus loading remain within the ADM4851AR's 32-node limit before substituting it for the ADM4852ARZ.
Package Type
High match
Pinout
High match
Supply Voltage
High match
Receiver Input Impedance
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADM4852ARZ | ADM4851AR | Why it matters |
|---|---|---|---|
| Data Rate | 2.5 Mbps | 500 kbps | Maximum signaling speed; the faster part supports higher-throughput buses while the slower part is limited to lower-speed networks. |
| Duplex Mode | Half-duplex | Half-duplex | Determines whether the transceiver can transmit and receive simultaneously; both are half-duplex, so they are functionally aligned here. |
| Number of Drivers/Receivers | 1/1 | 1/1 | Defines the channel count per package; identical configuration means either can serve a single bidirectional bus node. |
| Supply Voltage | 5 V | 5 V | Operating rail voltage; both require a 5 V supply, so power design is interchangeable. |
| Receiver Input Impedance (Unit Loads) | 1 unit load (12 kΩ) | 1 unit load (12 kΩ) | Determines how many nodes can share the bus; both being 1 unit load allows up to 32 standard nodes. |
| Fail-Safe Receiver | Yes (open-circuit, short-circuit, idle-bus) | Yes (open-circuit, short-circuit, idle-bus) | Guarantees a defined logic output when the bus is undriven, preventing spurious data; both provide true fail-safe behavior. |
| ESD Protection (Bus Pins) | ±15 kV (HBM) | ±15 kV (HBM) | Robustness against electrostatic discharge on the bus; identical ratings mean equal field reliability. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Ambient range over which specs are guaranteed; identical industrial ranges allow use in the same environments. |
| Package / Mounting | 8-Lead SOIC (surface mount) | 8-Lead SOIC (surface mount) | Footprint and assembly compatibility; matching SOIC packages permit drop-in board substitution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM4852ARZ | ADM4851AR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | Transceiver | Transceiver |
| Protocol | RS422, RS485 | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 | 1/1 |
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V |
| Mounting Type | Surface Mount | Surface Mount |
| Duplex | Half | - |
| Receiver Hysteresis | 20 mV | - |
| Data Rate | 2.5Mbps | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the primary differences between the ADM4852ARZ and ADM4851AR?
Both are half-duplex RS-485/RS-422 transceivers in 8-lead SOIC packages, but they differ in data rate and slew-rate configuration. The ADM4852ARZ is specified for up to 2.5 Mbps, while the ADM4851AR is a low-slew-rate version limited to 500 kbps for reduced EMI. The ADM4852ARZ also includes a driver enable (DE) and receiver enable (RE) pin configuration typical of the ADM485x family, whereas the ADM4851AR is optimized for low-speed, low-EMI applications.
Are the ADM4852ARZ and ADM4851AR pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with the same pinout: RO, RE, DE, DI, GND, A, B, and VCC. This allows a drop-in replacement in existing PCB layouts, provided the data-rate and slew-rate requirements of the application are satisfied.
What supply voltage do the ADM4852ARZ and ADM4851AR require?
Both devices operate from a single 5 V supply (4.75 V to 5.25 V typical operating range). They are not 3.3 V parts; for 3.3 V operation, other members of the ADM485x family should be considered.
What is the maximum data rate of each device?
The ADM4852ARZ supports data rates up to 2.5 Mbps, making it suitable for higher-speed RS-485 networks. The ADM4851AR is a slew-rate-limited version with a maximum data rate of 500 kbps, which reduces electromagnetic interference and improves signal integrity on long cables.
How many nodes can each device support on an RS-485 bus?
Both the ADM4852ARZ and ADM4851AR are specified as 1/8-unit-load (1/8 UL) transceivers, allowing up to 256 nodes to be connected to a single RS-485 bus. This is a key advantage over standard 1-unit-load devices limited to 32 nodes.
Do the ADM4852ARZ and ADM4851AR include fail-safe receiver features?
Yes. Both devices incorporate a fail-safe receiver that ensures a known logic-high output when the bus inputs are open, shorted, or terminated but undriven. This prevents indeterminate output states during idle bus conditions.
What are the typical applications for each device?
The ADM4852ARZ (2.5 Mbps) is suited for higher-speed industrial control, building automation, and data acquisition systems. The ADM4851AR (500 kbps, slew-rate limited) is preferred for low-EMI applications such as long-cable RS-485 networks, HVAC controls, and noise-sensitive industrial environments.
Are the ADM4852ARZ and ADM4851AR RoHS compliant?
Yes. Both the ADM4852ARZ and ADM4851AR are offered in RoHS-compliant packaging, as indicated by the "Z" suffix in the ADM4852ARZ part number and the standard RoHS status of the ADM4851AR. Designers should confirm the specific ordering code and compliance documentation from the manufacturer for their production requirements.